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South Africa
Kusasalethu Mine

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 Location:
15 SW from Carletonville, South Africa

  Address:
Elandsrand Dr
Carletonville
South Africa
2500
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sequential grid mining
  • Breast stoping with strike pillars
  • Backfill
Production Start...
Mine Life2 years (as of Jan 1, 2022)


Owners

Source: p. 83
CompanyInterestOwnership
Harmony Gold Mining Company Ltd. (operator) 100 % Indirect
Kusasalethu is wholly-owned and operated by Harmony.

Contractors

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Deposit Type

  • Conglomerate hosted


Summary:

Kusasalethu is located on the north-western margin of the Archean Witwatersrand Basin, one of the prominent gold provinces in the world. There are seven gold-bearing conglomerates within the mining right area, of which only the Ventersdorp Contact Reef (VCR) is economically viable. Kusasalethu is situated in the West Wits Basin and mines the Ventersdorp contact reef as its main orebody. The Ventersdorp Contact Reef facies model at Kusasalethu is based on the paleotopographic or slope and terrace model. Nine facies types have been recognised at Kusasalethu – eight sedimentological and one structural. Four of the facies are thick, high-grade, geologically distinct reef terraces separated from one another by a thin low-grade slope reef. The sand-filled channel is a thick low-grade facies. The Sandy Terrace Complex is found on the same elevation as the Terrace Complex but is essentially a pebbly quartzite with no grade. The Mondeor conglomerates have been identified sub-cropping against the Ventersdorp Contact Reef in stopes in certain areas and have been delineated as separate facies in these areas. The Elsburg conglomerates, found on the western side of Kusasalethu, form the footwall to the Ventersdorp Contact Reef and are part of the Turffontein Supergroup. It is a predominantly polymictic matrix-supported conglomerate of well-packed and moderately sorted, sub-rounded smoky (80%), black-grey (15%) quartz pebbles, chert (3%) and some elongated shale pebbles (2%). The matri ........


Mining Methods

  • Sequential grid mining
  • Breast stoping with strike pillars
  • Backfill


Summary:

Kusasalethu is a mature, deep-level mine. The mine comprises twin vertical and twin sub-vertical shaft systems, and uses conventional mining methods in a sequential grid layout. Mining is conducted to a depth of 3 388m and is Harmony’s deepest mine. Access to the orebody is gained through a twin shaft system from surface to 73 level. The twin sub shaft system extends from 73 level to 115 level. The VCR horizon is extracted at Kusasalethu, and mining is conducted over five levels (98 level to 113 level) using SGM techniques. Due to the current mining depths at Kusasalethu, the SGM method with backfill and pre-conditioning is used. The SGM method is preferred due to the variability of the VCR orebody with respect to value, and the seismic risk associated with deep level mining. The mining sequence used for breast mining is a V-shaped configuration, colloquially referred to as the “inverted Christmas tree”. An underhand face configuration is adopted when mining towards the west, and an overhand face configuration when mining towards the east. The SGM method makes use of dip pillars and reduced mining spans with pre-developed tunnels, aimed at further control of stresses experienced during rock movement. Primary development is done off-reef (in waste rock), while secondary development is done on-reef (in the mineralised zone). The 10m-diameter rock/ventilation shaft was initially sunk to 2 195m and the man/material shaft to 2 127m. By June 1984, a 10m-diameter sub-vertical ........


Crushing and Grinding
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Processing

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Summary:

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^ Guidance / Forecast.

Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required142,395141,270124,198
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202220212020201920182017
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required742 kt670 kt607 kt
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Reserves at June 30, 2022:
Kusasalethu 2022 cut-off 1,100 cmg/t.

CategoryTonnage CommodityGradeContained Metal
Proven 1.3 Mt Gold 6.97 g/t 294 koz
Probable 0.03 Mt Gold 6.84 g/t 7 koz
Proven & Probable 1.3 Mt Gold 6.97 g/t 301 koz
Measured 2.1 Mt Gold 11.53 g/t 761 koz
Indicated 8.6 Mt Gold 9.28 g/t 2,559 koz
Inferred 2 Mt Gold 8.85 g/t 576 koz
Total Resource 12.7 Mt Gold 9.58 g/t 3,896 koz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,143 / oz   1,051 / oz   1,026 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 1,342 / oz   1,238 / oz   1,254 / oz  
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Operating Costs:

Units20172016
Total operating costs ($/t milled) USD 222173

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M ZAR  ......  Subscription required
Capital expenditures M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 22  USD 21  USD
Revenue M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 193  USD 189  USD
Gross profit M  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 35  USD 36  USD
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Heavy Mobile Equipment:

Mine Management:

Job TitleNamePhoneEmailProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2022
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 27, 2022
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Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015
Subscription required Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Corporate Presentation 2022
Form 20-F 2022
Year-end Mineral Reserves 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Form 20-F 2018
Integrated Report 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Form 20-F 2017
Integrated Report 2017
Other 2017
Other 2017
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2017
Year-end Mineral Reserves 2017
Form 20-F 2016
Integrated Report 2016
Year-end Mineral Reserves 2016
Other 2015
Other 2014
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